Charge mobile devices while traveling with this Tzumi Endurance charger. It provides a stable 20,000 mAh power supply to two USB ports from the internal lithium-polymer battery, and it can recharge a typical smartphone up to 11 times before needing recharging itself. This Tzumi Endurance charger has four LED status lights to indicate its power level.

Digital output and size. This thing is 7.5" long, it's big. 10-15 hour charge time. Decent price and good reviews. I like the size of the Anker from Lowes better, but no longer available for $12.75 (10,400 mAh).

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